References
^ Cambridge ESOL (2014). Cambridge English First for Schools 1 Self-study Pack (Student's Book with Answers and Audio CDs (2)) : Authenticnbsp;Examination Papers from Cambridge ESOL, Cambridge Univ Pr. BiggerBooks. ISBN 9781107603219 (revised Jul 2024)^ (2013). Cambridge English First for Schools 1 Self-study Pack (Student's Book with Answers and Audio CDs (2)) : Authenticnbsp;Examination Papers from Cambridge ESOL ECampus. ISBN 9781107603219 (revised Mar 2023)
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